Unknown Worm

[Shock130]

Hello, Ive had this worm in my tank for years, Its impossible to get a picture of him. but it he stays in the same spot, the EXACT same spot on the rock, its black, and kinda "rolls" out from within it seems. it comes out at night, and when u put the flashlight on it, it appears to roll inward. If that makes any sense... lol anyone have any idea what it might be? He lives among a zoa colony and doesn't seem to harm anything.

 

[SNAKEMANVET]

sounds like a peanut worm,when they retract it looks like that. It's harmless.

 

[Shock130]

that sounds about right, Thanks! Ive always wondered what it was.

 

[SNAKEMANVET]

I have one that extends to about 4'' and has lived in the same piece of live rock for a year now.